Compute the directional derivative of fat the given point in the direction of the indicated vector. f(x, y) = ³x²-y, (1, 3), u in the direction of -2i- j Duf(1,3)=
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Q: Use Δy≈f′(x)Δx to find a decimal approximation of the radical expression. \sqrt{125}
A: Let's find sqrt(125) by using linear approximation.
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